Add HBFav flavor gson test
Add volley as dependency
:airplane: AsyncHttpClient :arrow_right: Volley!
:wave: Android Asynchronous Http Client
Renew test structure
:new: TimelineFeedManager#cancelAllRequest
Cancel all request when category has changed in Entrylist and Hotentry
Remove username observer
More stable BaseEntryListFragment
Change TimelineFeedManager not to be Singleton class

Consistent to BaseFeedManager
Beautify navigation drawer style

* Widen navigation drawer width
* Draw navigation list divider
* Icon place for list item
Add navigation item icons
Show icons on NavigationDrawer
Merge branch 'volley'
Fix build error after merge 'volley' branch
Invalidate timeline list view on TimelineListFragment#onStart

When user went background during loading first timeline,
Timeline will be never fetched.
This commit fixes the issue.
Fix not to load more timeline data when TimelineListFragment#onStart
Fix crash when prepend emptry timeline entries
Update navigation icons
:up: timeline stability

* Shows progress bar every onStart
* Minor logic refactor